YoungForest's blog

Official editorial Problems on Codeforces are generally harder than ordinary interview problems. If your goal is only interviews, practicing LeetCode is enough. But if you are interested in algorithms and competitive programming, I strongly encourage you to give it a try. The quantity and quality o

RankNameScoreFinish TimeQ1 (4)Q2 (4)Q3 (6)Q4 (7)589 / 9816YoungForest190:55:300:07:040:15:050:37:18 10:50:30Today was another speed contest. Python tells us, “Life is short; I use Python.” I implemented two problems in Python, problems 1 and 4. In fact, for problem 3, directly calling Python’s Str A

RankNameScoreFinish TimeQ1 (3)Q2 (5)Q3 (5)Q4 (6)199 / 7026YoungForest190:40:570:08:050:11:440:33:380:40:57Not difficult; a speed contest. I found that in many speed contests, the third problem is sometimes even harder than the fourth. 1399. Count Largest Group Straightforward. Use a HashMap to coun

RankNameScoreFinish TimeQ1 (4)Q2 (4)Q3 (6)Q4 (7)91 / 12542YoungForest210:39:070:09:240:15:330:29:530:39:07This week was another speed contest, and a full 800 people got AK. Maybe because of the pandemic, programmers are all WFH (work from home), and the number of participants in every weekly contest

RankNameScoreFinish TimeQ1 (3)Q2 (4)Q3 (5)Q4 (8)727 / 11694YoungForest120:22:500:03:130:14:040:22:50nullThis Monday I joined a LeetCode daily check-in and weekly contest group. It publishes rankings every week, and the bottom-ranked person sends a red packet; every day there is a designated problem

RankNameScoreFinish TimeQ1 (4)Q2 (4)Q3 (5)Q4 (6)1357 / 5632YoungForest121:27:090:05:060:48:41 11:22:09null1385. Find the Distance Value Between Two Arrays Sort arr2 first. Then for every element in arr1, use binary search to determine whether arr2 contains a value within distance d. Time complexity

Since LeetCode updated its rating algorithm, my rating reached its peak and has been dropping ever since. But that is also because I am not good enough; every contest I rank several hundred places down, and occasionally over a thousand. RankNameScoreFinish TimeQ1 (3)Q2 (4)Q3 (5)Q4 (6)839 / 10930You

Kick Start has changed a little in the new year: 1. Whether all test results are correct is now returned immediately. Previously, large dataset results could only be seen after the contest. This is effectively a difficulty reduction and reduces the cost of mistakes for contestants. In the past, on

First Round time: 2020-03-20 16:29:48 Last Friday I took the written test on Nowcoder. The questions were not hard and were divided into computer science fundamentals, algorithms, and system design. For computer science fundamentals, thanks to serious undergraduate study, there was no problem. The

Since LeetCode updated the weekly contest rating algorithm, the result shocked me. My rating directly rose to 2171, with global rank 608/81184 and 53 contests completed. I remember that last week I was still hoping to break 2000 in the next few weeks, since I was already 1990+. The updated algorithm